Using the supply schedule and Kerala demand schedule for the fish Puntius euspilurus: | Price P per kg (in ₹) | Quantity (X) of Fish Supplied (in kg) | |---|---| | 25 | 800 | | 20 | 700 | | 15 | 600 | | 10 | 500 | | 5 | 400 | | Price (p) per kg (in ₹) | Quantity (x) of Fish Demanded (in kg) | |---|---| | 25 | 200 | | 20 | 400 | | 15 | 600 | | 10 | 800 | | 5 | 1000 | The value of x at equilibrium is (a) $\frac{1400}{3}$ (b) 600 (c) 15 (d) $\frac{200}{3}$

> [!TLDR] > Equate the supply curve $p=-15+\tfrac{x}{20}$ and the demand curve $p=30-\tfrac{x}{40}$ and solve to get $x=600$ kg — option (b). > [!FORMULA] > **Equilibrium:** demand price $=$ supply price at the same quantity $x$. 1. Supply: $p=-15+\dfrac{x}{20}$; Demand: $p=30-\dfrac{x}{40}$. 2. Equate: $-15+\dfrac{x}{20}=30-\dfrac{x}{40}$. …

Using the supply schedule and Kerala demand schedu – Class 12 Applied Mathematics

Case Based · Q3

Using the supply schedule and Kerala demand schedule for the fish Puntius euspilurus:

Price P per kg (in ₹)	Quantity (X) of Fish Supplied (in kg)
25	800
20	700
15	600
10	500
5	400

Price (p) per kg (in ₹)	Quantity (x) of Fish Demanded (in kg)
25	200
20	400
15	600
10	800
5	1000

The value of x at equilibrium is

$\frac{1400}{3}$
600
15
$\frac{200}{3}$

Puducherry CbseNCERTSubjective· 1mImportance★★★★★est

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Concept understanding — Supply Schedule

Supply Schedule: From Intuition to Definition

Imagine you run a small stall selling lemonade. On a hot day, you might be willing to sell 50 glasses at ₹10 each. But if the price jumps to ₹20, you'd happily make and sell 100 glasses — maybe even stay open longer. If the price drops to ₹5, you'd barely bother, selling only 10 glasses.

That relationship — "at this price, I will supply this much" — is the core idea. A supply schedule is simply a table that records this pairing: for each possible price, it shows the quantity a seller is willing and able to offer for sale.

The Precise Statement

A supply schedule is a tabular statement that shows the different quantities of a commodity that a firm (or an industry) is willing and able to offer for sale at different possible prices, during a given period of time, ceteris paribus (all other factors held constant).

There are two types:

Type	What it shows	Who it's for
Individual Supply Schedule	One seller's quantities at various prices	A single firm
Market Supply Schedule	Total quantities from all sellers at various prices	The entire market

Market Supply = Sum of all Individual Supplies at each price

A Concrete Example

Individual Supply Schedule (Lemonade Stall)

Price (₹ per glass)	Quantity Supplied (glasses per day)
5	10
10	50
15	80
20	100

Notice the pattern: as price rises, quantity supplied rises. This is the Law of Supply — the direct, positive relationship between price and quantity supplied, visible directly in the schedule. …

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Equate the supply curve $p=-15+\tfrac{x}{20}$ and the demand curve $p=30-\tfrac{x}{40}$ and solve to get $x=600$ kg — option (b).

=

Supply: $p=-15+\dfrac{x}{20}$ ; Demand: $p=30-\dfrac{x}{40}$ .
Equate: $-15+\dfrac{x}{20}=30-\dfrac{x}{40}$ . …

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